Bleeder valve



DeCfZ" 1958 J; MERCIER liz-TAL 2,862,513

BLEEDER VALVE:

original Filed March '31, 1955 N. .Nw Y @N/ xm Nw Nm mm United States Patent() BLEEDER VALVE Y Jean Mercier and Jacques H. Mercier, New York, N. Y.

Original application March 31, 1953, Serial No. 345,986,

now Patent No. 2,772,690, dated December 4, 1956. gsividg and this application June 1, 1956, Serial No.

4 claims. V(cl. 137-117) consequences may occur especially where the unit controls the brakes of a vehicle, for example.

It is accordingly among the objects of the invention to provide a bleeder Valve that is compact, relatively rsimple in construction, having but few parts that are not' likely to become deranged, which may readily be manufactured by mass production methods, and which will automatically and dependably bleed fluid from a iluid pressure line when the proportion of liquid to gas in such line-is below a predetermined amount and when the proportion of liquid to gas exceeds 'such amount will quickly stop further bleeding action.

Another object is to provide a valve of the above type which will bleed accumulated gas from a pressuresy'stem with substantially 'no interference with its normal operation.

According to the invention, the valve comprises a casing having an inlet, an outlet and a bleeder port. The bleeder port is controlled by a valve member associated with the bleeder port and normally retaining the latter open and in communication with the inlet for bleeding o-f gas from the valve.

The valve member is normally retained in open position until the rate of ow of the fluid forced into the inlet rises above a predetermined amount, at which time, by means of venturi action, the valve member will move to closed position. y

This application is a division of copending application Serial No. 345,986, tiled March 3l, 1953, now Patent No. 2,772,960, dated December 4, 1956, which in turn is a continuation-in-part of abandoned application Serial No. 648,7ll, filed February 19, 1946.

In the accompanying drawing in which is shown one of various possible embodiments of the several features of the invention, the single figure is a longitudinal cross sectional view of the valve in horizontal position.

Referring now to the drawings, the bleeder valve desirably comprises 'a substantially cylindrical casing 11 having a bore or passageway 12 therethrough with a liquid inlet 13 at one end, a bleeder section 14 and a liquid outlet 15 at the other end, the casing being of reduced diameter as at 16 adjacent the liquid outlet 15.

The valve is designed for use in a system through which ilows uid under pressure, and desirably is internally threaded at each end as at 17 and 18, for ready connection in a fluid line.

The bleeder section of the valve desirably comprises a substantially cylindrical boss 19 extending radially outward from the casing and having an enlarged bore 21 leading into the casing passageway 12, the bore 21 deexerted by spring 32 and the atmosphere pressurek "we i 2 sirably being in communication with the reduced portion 16 of the casing passageway 12 by means of an inclined ductl 22 having its inlet 23 in said reduced portion and its outlet in bore 21. k

Slidably mounted in bore 21 is a piston 25, desirably cup-shaped as shown, which 4may have adepending pin 26 rigid therewith to abut against the casing wall to limit the downward movement of said piston. The piston de' sirably has an axial stem 27 rising therefrom, having a conical tip 28 at its free end, defining a valve head which is normally retained spaced from an axial'bore 29 of relatively small diameter, in a cap 31 threaded on the outer end of boss 19, by means of a coil spring 32 compressed between the piston 25 and cap 31. Y

When the casing 11 is interposed, for example, in a line leading from a pump, and the pump is started, as the initial pumping action may force both liquidv Yand gas into the casing 11, in spite of the reduced portion 16, the rate of flow of the liquid past the inlet 23 of duct 22 will initially be relatively low and hencethe venturi action caused by such ilowV Will be negligible -and the pressure exerted against opposed faces of thev piston25 will be substantially equal and the spring 32 will retain valve head 28 spaced from the inner end 34 of bore 29, Due to the natural tendency of gas such as air to risev in a liquid, appreciable separation will occur and such air will pass through duct 22 and bores 21- and .29 for discharge to the atmosphere. s Q

As the direction of ow of liquid is substantially .opf posite to the inclination of duct 22, little or no liquid will enter the latter and substantially only A the air in th liquid will be discharged from bore 29. l., VAs the pump operation continues, the quantity Vof air. forced from its loutput will be reduced andthe rate of flow of the liquid will increase. vAssuming thatthe pres'-, sure in the liquid inlet 13Y and the bleeder section 14 of the casing is p. s. i., such pressure will also be exerted against the undersurface of piston 25. If the increased rate of flow of the iluid, due to the restricted portion 16, is such that the pressure therein drops to 50 p. s. i., such pressure will also be exerted on the contents of bore 21 and hence against the upper surface of piston 25. As a result there will be a diierential pressure of 50 p. s. i. exerted in an upward or valve-closing direction against piston 25 which will overcome the force through bore 29 against the contents of bore 21 and hence against the piston. Consequently, the resultant upward thrust on the piston 25 will move the valve head 28 to close the inner end 34 of bore 29.

With the construction above described, as long as the Vrate of ow of liquid is high enough to reduce the pressure against the contents of bore 21 to overcome the normal eiect of spring 32 and the atmosphere pressure,

valve head 28 remains closed with the result that all of the liquid forced into the casing 11 will flow into the hydraulic system.

If a sutlicient quantity of gas should be forced by the pump into the casing 11 to reduce the rate of ow below that required to reduce the pressure on the contents of bore 21 suiciently to overcome spring 32 and the atmospheric pressure, valve head 28 would again open to permit bleeding from the casing 11.

It is apparent therefore that automatic control of the bleeding action is provided by the valve to prevent an excessive amount of gas in the hydraulic system which might cause malfunctioning of the equipment to be operated.

As many changes could be made in the above construction, and many apparently widely different embodiments of this invention could be made without departV` 3 ingfrom the' scope of the claims, it is intended that all matterV contained in thev above description or Shown in the accompanying drawing shall be interpreted as illustrative and n ot in a limiting sense.

Having Vthus described "our invention, what we claim new and desire" to secure Lettersy Patent of the United States' is:

, 1, A bleeder valve construction comprisinga casing having a' passageway therethrdigh with a vliquid inlet at one end, a liquid 'outlet 4Aat thefother end and a bleeder Section therebetween having a' discharge bore of diameterjsnialler than that of said liquid "outlet, a valve controlling sfaid discharge bore, resilient means normally retaining s'id valve in open position with respect to said discharge bore, said casing 'passageway having adjacent portions of different diameters whereby the uid flowing through said portions win, as the dw ve1ocity there: through increases, create a differential pressure in said portions, frecipocabl'e member controlling said valve, said reeiprocable member 'having one Vside thereof Lei(- posed to the higher pressure created in the larger of said p'rtidns, means associated with the smaller of said portioiisto create Aa Ventri effect to provide a lower pres: s 'ur'gains't the other side of "said reciproca'hle member, said reciprocable member being movable against saidv 1 cnt means when the difference between Said presi sures eX'ceeds a predetermined amount to overcome the force fof .said resilient means, thereby 'moving said valve to 1 close said discharge bore. 2. The combination set forth in claim 1 in which said bleeder section comprises a bore in communication at one end with said casing passageway 'and extending V'at' right angles thereto, said Vdischarge bore being at the otherend of said bleeder 'section'bore, 'a piston slidably niouted'in said bleeder section bore and controlling said valve, said piston having one surface exposed to the pas? sageway, said vresilient means reacting against said piston to urge the'latter toward said passageway, means to limit the movement'of said piston toward said pas- CII sageway and the means to expose the other side of the piston'to the lower pressure comprises a duct leading from the smaller diameter portion of said passageway into said bleeder section bore.

3. The combination set forth in claim 2 in which said duct is inclined so as to provide an acute angle at the end thereof leading into said casing passageway.

4. The combination j set forth in claim 2 in which said resilient means is a coil spring.

Referenties Cited in the le of this patent UNITED STATES PATENTS 104,593 Hovey June 21, 1870 277,189 Atwell May 8, 1883 323,992 Wilcox Aug. 1l, 1885 358,148 Desmond Feb. 22, 1887 1,440,808 Wineman Jan. 2, 1923 1,478,600 Denspel Oct. 16, 1923 1,553,940 Kangie's'er Sept. 15, 1925 1,775,362 Demarcus Sept. 9, 1930 1,908,357 Hornschurch May 9, 1933 r`1,934,758 Temple Nov. 14, 1933 2,034,914 Lanser Mar. 24, 1936 2,061,517 Kenny Nov. 1 7, 1936 2,108,272 Seyforth Feb. 15, 1938 2,152,695 Hornschurch Apr. 4, 1939 2,157,596 Davis May 9, 1939 2,223,699 Norgren Dec. 3, 1940 l2,231,341 Lichte Feb. 11, 1941 2,318,962 Parker May 11, 1943 2,394,987 Deming Feb. 19, 1946 2,397,664 Hillier Apr. 2, 1946 2,399,996 Fitch May 7, 1946 2,503,424 Snyder Apr. 11, 1950 FOREIGN PATENTS 128,891 Great Britain July 3, 1919 25,388 Australia Nov. 20, 1930 

